Carrier MINIMUM LOAD CONTROL ACCESSORY 30RB060-390 - Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53300047-01 Printed in U.S.A. Form 30RB-16SI Pg 1 3-10 Replaces: 30RB-4SI
Installation Instructions
Part No: 00EFN900000100A
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equip-
ment can be hazardous due to system pressures, electrical com-
ponents and equipment location.
Only trained, qualified installers and service technicians
should install, start up, and service this equipment.
When working on air-conditioning equipment, observe
precautions in the literature, on tags, stickers, and labels
attached to the equipment.
Follow all safety codes. Wear safety glasses and work
gloves. Use care in handling equipment.
GENERAL
This control accessory reduces 30RB chiller capacities be-
low the standard lowest capacity step. This capacity reduction
provides more precise control of leaving fluid temperature
during light load conditions.
The solenoid valve limits the amount of gas that can be
bypassed from the condenser without impacting oil return.
One accessory package is required for 30RB060-190 units
and for each module of duplex units 30RB315-390. Two
accessory packages are required for 30RB210-300 units to
accommodate connections for all three refrigerant circuits. See
Table 1 for modular unit combinations.
Table 1 — Modular Unit Combinations
NOTE: An “A” in the model number indicates the design series.
INSTALLATION
Examine the package contents for correct part numbers. If
any of the components are damaged, file a claim with the
shipping company and notify a Carrier representative.
See Table 2 for package contents. See Fig. 1 for dimensional
drawings of tubes included in the kit.
The following material is field supplied:
• 1 /
2
in. OD copper tubing
• standard 1 /
2
in. copper tube elbows and couplings as required
Install the Solenoid Valve
1. Shut off power to the unit.
2. Remove refrigerant charge from the unit.
3. Locate the factory-supplied stub on the discharge line for
each circuit. Locate the 1 /
2
in. NPT pipe plugs at the
blank end of the cooler for 30RB110 circuit B and
for both circuits A and B on 30RB060-300 units. See
Fig. 2.
4. Remove the 1 /
2
in. NPT pipe plugs from the blank end
of the cooler. Use an appropriate thread sealing
compound and install one 1 in. — 14 O-ring seal
adapter for each circuit. Lightly lubricate each O-ring
and attach a 5 /
8
in. O-ring seal tube assembly to each
adapter. This nut should be torqued to 30 ft-lb (40 N-
m). For 30RB110 circuit A size only, use a tubing cut-
ter to cut off the end of the stub tube. See Fig. 3.
5. Assemble the hot gas bypass line in the following order:
a. Remove the discharge stub tube and braze the cor-
rect beaded tube in place.
b. Braze the ball valve to the beaded tube.
c. Braze the solenoid valve into the line.
d. Using field-supplied tubing, connect the solenoid
valve to the low side connection, either the cooler
or the liquid line.
e. Clamp the 5 /
8
-in. tube to the rail. See Fig. 4 and 5.
Use field-supplied 1 /
2
in. OD copper tubing and fit-
tings (as required) to plumb from the solenoid valve
outlet to either the adapter tube in the cooler or stub
tube in the liquid line depending on unit size. Tube
support brackets and 1 /
2
in. tubing clamps are provided
with the kit. Install brackets to the bottom of the coil
bases to support tubing.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all discon-
nect locations to alert others not to restore power until work
is completed.
IMPORTANT: This accessory can only be used on units
configured for Cooler Fluid Type (Configuration
 SERV  FLUD = 1 [Water]). The minimum load control
accessory (HGBP) is not allowed on units configured for
Cooler Fluid Type (Configuration  SERV  FLUD = 2
[Brine]).
UNIT SIZE MODULE A MODULE B
30RBA315 30RBA160 30RBA160
30RBA330 30RBA170 30RBA160
30RBA345 30RBA170 30RBA170
30RBA360 30RBA190 30RBA170
30RBA390 30RBA190 30RBA190
WARNING
Shut off all power to the unit. Lock out and safety-tag all
disconnects. Remove refrigerant charge from the circuits
using an approved refrigerant recovery device before
proceeding with this installation. Follow good piping
practices. Severe personal injury could result.
30RB060-390
Minimum Load Control Accessory